<template>
  <div>
 <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>数据统计</el-breadcrumb-item>
            <el-breadcrumb-item>数据报表</el-breadcrumb-item>
        </el-breadcrumb> 

        <!-- 卡片视图区域 -->
        <el-card>
           <!-- 为 ECharts 准备一个定义了宽高的 DOM -->
             <div id="main" style="width: 750px;height:400px;"></div>
        </el-card>
  </div>
</template>

<script>
//1.导入 echarts
import *as echarts from 'echarts'
import _ from 'lodash'
export default {
    data(){
        return{
            //需要合并的数据
            options: {
        title: {
          text: '用户来源'
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross',
            label: {
              backgroundColor: '#E9EEF3'
            }
          }
        },
        grid: {
          left: '3%',
          right: '4%',
          bottom: '3%',
          containLabel: true
        },
        xAxis: [
          {
            boundaryGap: false
          }
        ],
        yAxis: [
          {
            type: 'value'
          }
        ]
      }
        }
    },
    created(){},
    //此时，页面上的元素,已经被渲染完毕了
    async mounted(){
         // 3.基于准备好的dom，初始化echarts实例
      var myChart = echarts.init(document.getElementById('main'));
      const {data:res} =await this.$http.get('reports/type/1')
      if(res.meta.status!==200){
          return this.$message.error('获取折线图数据失败')
      }
      //4.准备数据和配置项
       const result =_.merge(res.data,this.options)

      //5.展示数据
       myChart.setOption(res.data);
    },
    methods:{}

}
</script>

<style scoped>

</style>